My ones, shown in my previous post, have open foot pockets which are designed for being used with booths.Seems like there are more reasons not to use them than there are reasons to, including the difficulty traveling, and not being able to wear booties.
Just seems not ideal to me. I have seen divers trying to lobster with them and it’s definitely not a good situation.
Anyway, just curious to why...
I started using them when I was working at Maldives. In channels the current is very strong, no way to swim against it without long, powerful freediving fins and a super-streamlined, low friction setup.
After learning how to use them properly, and to get optimal efficiency and perfect control, I never moved back to shorter fins.
After my years as instructor at Maldives, I moved to cave diving at Capo Caccia, Sardinia. I did dive there for 10 years, doing also extreme penetration (Grotta di Nereo, etc.).
But I always continued using my beloved freediving fins, learning how to use them properly in narrow passages.
Of course you cannot frog kick with them.
But frog kick, apart being terribly inefficient and inelegant, is substantially forbidden in these Italian caves, as their most nice feature is the red coral growing abundant under the ceiling of the cave. So you cannot flex your knees and have the fins higher than your body, as US cave divers do.
You must always stay perfectly horizontal and with perfectly straight legs, with knees and ankles fully extended.
As one raises the fins towards the ceiling, the divemaster immediately sacks you and invite to exit the cave.
For going forward you can use the horizontal scissor kick, which avoids raising dust from the bottom and to hit the red coral above you.
Freediving fins are very efficient with horizontal scissor kick...
So I do not see significant problems using long freediving fins even inside caves or wrecks, of course if the diver spent the required 100-200 dives necessary for learning how to use them properly in various environments.
I would not recommend them for beginners, but they are great for experienced divers when you want maximum performances in very deep dives, or for extended penetration in caves.